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In this study, limestone was calcined in O2/CO2/steam atmosphere with heat supplied from coal combustion. Steam was supplied to the calciner to improve CaO reactivity. However, steam gasification behavior during coal combustion in O2/CO2/steam atmosphere is unclear. This experimental study was conducted to clarify the role of steam in coal combustion using an isotope tracer technique. H218O was used...
Via isolating the fuel pyrolysis and char gasification, the so-called dual bed pyrolysis gasification (DBPG) was proposed to realize the co-production of pyrolysis products and gasification gas. The process simulation with Aspen Plus shows that the DBPG process can run autothermally using air as the gasification reagent, but the complete conversion of char in the gasifier requires relatively high...
Through separating coal pyrolysis and char combustion and letting the pyrolysis gas burn in its passing through the combusting char bed, the so-called decoupling combustion has been proven to be effective for lowering NO x emission of coal and biomass combustion. The original design of the decoupling combustion was based on coal pyrolysis incurring with the heat transferring from the char...
The main aim of this paper is to determine the potential capability of removing volatile hazardous elements from coal before its further utilization by decoupled conversion of coal. The so called decoupled conversion isolates the combustion/gasification into two consecutive stages: pyrolysis followed by char combustion/gasification. Previous studies indicated that pyrolysis could transfer a part of...
The isothermal differential characteristics of the gas–solid reaction occurring in a micro-fluidized bed reactor were studied using the indigenously developed Micro-Fluidized Bed Reaction Analyzer (MFBRA). The combustion of graphite powder in micrometers was taken as the model reaction because of its negligible internal diffusion and chemical-reaction simplicity. With minimized inhibitions from both...
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